Lamp-locking device.



J. c. MANLBY, J. THULIN a. P. J. SMITH.

LAMP LOCKING DEVICE.

APPLICATION Hmm 1120.14, 1911.

Patented Oct. 8, 1912.

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JOHN' C. MANLEY, JOHN THUIIN, AND PETER J. SMITH, OF CHICAGO, ILLINOIS, ASSIGNORS TO INVENTORS DEVELOPMENT C0.,'OF CHICAGO, ILLINOIS.

LAMP-roomate DEVICE;

To all uz/wm it may concern Be it known that we,l JOHN C. Manner, Jol-1N THULIN, and PETER J. SMITH, citizens of the United States, residing at Chicago, n the county of Cook and State of Illinois, have invented a certain new and us'et'ul Imprevement in Lamp-Locking Devices, of

which indents' the thin lamp shell and occupies the indentation, thus to hold the lamp` in place. 'The device is preferably key opera-ted.

In the present application means are provided -whereby these 'features may be applied to standard forms of porcelain sockets in such a way that the locking device is permanently associated with the socket itself.

The invention will now'bc described in connection with the accompanying drawing illustrating its preferred form, in which- Figure 1 is a. side view of a socketconstructed and arranged in accordance with our invention; Fig. 2 is a sectional view more clearly to illustrate the features involved; Fig. 3 is an enlarged view of the locking mechanism of Fig. 2, and Fig. 1l is a sectional view of a modification.

In the illustration a plate 1 is set forth upon which sockets are to be mounted, which sockets are of vthe porcelain variety and are made preferably 'in two pieces. A socket 2 is illustrated in the figures and this socket has an upper member 3 provided with a me- .tallic screw threaded member 4. and an outer porcelain collar 5 having a screw threaded interior to engage the member 4. thereby to hold the socket in place upon the plate 1. The metallic shell 4' has holes 6, 6 whose purpose will be more clearly understood hereafter. The lamp 7 is adapted for association with the socket and engages the screw-threaded element 4 when in pla-ce. The invention is designed to prevent the 1inauthorized withdrawal of these lamps and 'to Specification of Letters Patent.

Patented oet. s, 1912.

Application led December 14, 1911. Serial No. 665,797.

this end 'an indenting member 8 is provided having key controlled means 9 operable by' means of a key 10. The indenting member.

8 is screw threadedly associated with a Washer 11, which washer is. inserted from within the element 5 into a recess 12, which recess is narrowed to provide the shoulders 13 and thcn'continues as a recess of less cross section 14 intol which the key 10 may be inserted. The washer 11 -thus holds the indenting member 8 in place. The indenting member S is preferably provided with a sharp projection 15 which when actuated is adapted to indent the thin metal shell 1G of the lamp 7. This is more clearly shown in Fig. 3. The member 8 then occupies the indentation and prevents withdrawal of the lamp 7. The key 10 and its cooperating portion ,9 may be of any suitable construction to guard against misuse. Then the socket portion 5 is screwed into place, it must be stopped at such a point that; the in- `deruting member 8 registers with one of the holes 6 so that the indenting member may pass through this shell 4 to engage the lamp shell 16. A spring washer 17 is included between the elements 3 and`5' in order that the elements may be held tightly in place even though these elements themselves do not both engage the plate 1, as it may be necessary to have 'oneelement slightly re'- moved as one of the holes 6 must register with the member 8.

In Fig. 4 we show a modification in which a socket member 18 is mounted on one side of the plate l and a metallic shell 19 holds this socket member in place. This socket member then has the4 indenting member and allied vparts the same as illustrated for the construction not' Figs., 1 'and 2. In this latter structure of course there need not be a pluralty ot registering apertures 6 as in the case ofthe structures of Figs. 1 and 2.

,Ihe importance of the device will-be more apparent when it is' taken into account that the present day lamps of the tungsten variety are very expensive and are the source ot' much unauthorized removal.

It. will ot' course be apparent that changes may be made in thcdevice herein disclosed without departing from the broad features of the invention herein. and the specific de- ,scription lgiven above of the particular form set forth herein is not intended to limit the invention to this particular form.

Having, however, thus described one embodiment of our invention, We claim as new und debire to eecme'by Letters Patent tlie following z The combination with a socket having a body portion constructed ot' insulating material of a lamp adapted for association with said soole't,.f1nd locking means to prevent the unauthorized Withdrawal of the lamp from said socket mounted Wit-hin said nsulating body portion, said looking means including a key controlled inclined indenting member adapted to indent the 1am-p sliell when actuated and to occupy the indelt-a 15 tion, a metallic element with which said in denting member has screw threaded engagement mounted Within said body portion, and offsets provided in said insulating body portion to prevent Withdrawal of said metallic element from Without.

In witness whereof, we hereunto Subscribe om.A names this 8th day of December A. D., 191]..

JGHN C. MANLEY. JHN THULIN. PETER J. SMITH.

lWit/ness/s O. M. WERMICH, HAZEL JONES. 

